I fantasins världar ("In the Worlds of Fantasy") is a Swedish-language collection of essays on "fantasy fiction". The chapter entitled "Tillsammans med Tolkien" ("Together with Tolkien") includes a 1961 interview with J.R.R. Tolkien.

The new book from Jan Broberg centers around the wide notion known as "fantasy fiction" - a genre with unclear borders. Some regard the origin of the genre to be in the sailors' stories of the classical antiquity, e.g., the encounters of Ulysses with cyclops and sirens, and in the horror stories of the 18th and 19th century. It is a fitting title Jan Broberg has chosen for his collection of essays: In the worlds of fantasy.

Some of the headings reveal the span of the book: "Werewolf and Unicorn", "In the Age of Witches", "Prince Valiant, King Arthur, and the Holy Grail", "The Ghost-hunters", "Tarzan in the Land of Fairy-tales", "The Advendures of Flash Gordon". The book also includes interviews with J.R.R. Tolkien and Richard Adams.